Just in case you'd want to know, you can buy OEM parts from Kreidler in Germany.
This past winter I fixed up an MP-19. Had no trouble ordering every single part my heart desired, brand-new, from Kreidler. I looked up all the parts I needed on their website to get the part numbers. Then I emailed my list. They sent me a proforma invoice. I paid them with PayPal and 10 days later I had a big box of parts from Kreider. Easy peasy.
One of the parts I ordered was, by the way, a new decomp valve. It wasn't cheap at about $35 USD.
Prices for the most part weren't bad. One place here in the USA wanted to sell me a used engine side cover for $50. I bought a brand-new one from the factory for $40. Granted I paid the steep German tax and shipping but it was still worthwhile as I ordered quite a pile of parts.